Oracle Error - 1467

Hi Friends,

        I am having a sql statement where

select field1,field2.. field15, sum(fieldx1), sum(fieldx2).. sum(fieldx200) from t1
group by field1,field2.. field15;

when i execute this statement , i am getting error - 1467 which says sort key too long

 Cause Mentioned in the document : A DISTINCT, GROUP BY, ORDER BY, or SET operation requires a sort key longer than that supported by Oracle. Either too many columns or too many group functions were specified in the SELECT statement.

Action: Reduce the number of columns or group functions involved in the operation.

My question is whether any restrictions on no of columns that can be grouped is there or is it depend on any space constraint on temporary tablespace..

Thanks in advance,
Shankar

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